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    <title>Sentinel Toolbox Help - Definitions, Acronyms, Abbreviations</title>
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<table class="header" width="100%">
    <tr class="header">
        <td class="header">&nbsp;
            Definitions, Acronyms, Abbreviations</td>
        <td class="header" align="right"><a href="./SnapOverview.html"><img src="../../images/snap_header.jpg" border=0></a></td>
    </tr>
</table>

<h3>Definition of Terms</h3>

<table>

    <tr><td>(Data) Product</td>
        <td>An object that contains remote sensing data for a well known scene on the earth.
            Within the Sentinel Toolbox, a product can contain meta-data, geo-coding information, tie-point grids and bands.
            All band raster datasets within a product have the same pixel resolution and share the same
            geo-coding.
        </td></tr>

    <tr><td>Band</td>
        <td>A spectral or geophysical raster dataset of a product. The band's sample values are usually the
            measurements of a sensor.
        </td></tr>

    <tr><td>Tie-point grid</td>
        <td>An auxiliary (geophysical) raster dataset of a product. Tie-point grids usually provide less sample values
            than a band. Missing values, with respect to the full pixel resolution of a product, are obtained by a
            linear interpolation. The tie-point grid data does normally not originate from the sensor which provided
            the product's measurement data.
        </td></tr>

    <tr><td>Geometry</td>
        <td>A geometric shape (point, line, polyline or polygon). Geometries can be drawn on a scene view.
        </td></tr>

    <tr><td>Mask</td>
        <td>Marks a regions of raster dataset. Masks can be derived from an expressions, a value range or a geometry.
        </td></tr>

    <tr><td>Flag-Dataset</td>
        <td>A special band type which contains quality flag information.
            Flag datasets always have an unsigned integer data type (8 to 32 bit).
            Flag values are encoded through one or more bits:
            A flag is considered as set when a specific bit combination is met.
            Each flag's metadata is stored in a corresponding flag coding object.</td>
    </tr>

    <tr><td>Flag-Coding</td>
        <td>Flag codings are used to specify the bit positions of single flags within an integer sample value
            of a quality flags dataset. Each element in a flag coding provides the metadata for a flag such as
            the name, description and a bit-index.
        </td></tr>

    <tr><td>Index-Coding</td>
        <td>Index codings are used for classification bands. It maps a sample value of the band to a class by using the value as index.
            Each element in an index coding provides the metadata for a class such as the name, description and the index.
        </td></tr>


    <tr><td>Geo-Coding</td>
        <td>Provides the geodetic co-ordinates for a given pixel of a product.
            An image is geo-coded if it is somehow possible to find the geographical latitude and longitude values for
            any pixel.
            SNAP products store their geo-coding information in tie-point grids or bands.
            If a product has been map transformed,
            it is known to be geo-referenced and as such, tie-point information is no longer required.
        </td></tr>

    <tr><td>Geo-Reference</td>
        <td>An image is geo-referenced, if any point in the image can be found in a corresponding reference
            map by a linear transformation. Every pixel in the image has the same size if expressed in map units.
            Geo-referencing a
            geo-coded image includes image warping, applying a well known map projection and pixel re-sampling.
        </td></tr>

    <tr><td>Map</td>
        <td>Graphic representation of the physical features (natural, artificial, or both) of a part or the whole of the
            Earth's surface, by means of signs and symbols or photographic imagery, at an established scale, on a
            specified
            projection, and with the means of orientation indicated.
        </td></tr>

    <tr><td>Map Projection</td>
        <td>Orderly system of lines on a plane representing a corresponding system of
            imaginary lines on an adopted terrestrial or celestial datum surface. Also,
            the mathematical concept for such a system. For maps of the Earth, a projection
            consists of a graticule of lines representing parallels of latitude and
            meridians of longitude or a grid. </td>
    </tr>

    <tr><td>Graticule</td>
        <td>Network of parallels and meridians on a map or chart. A geographic graticule is a system of coordinates of
            latitude and longitude used to define the position of a point on the surface of the Earth with respect to
            the
            reference ellipsoid.
        </td></tr>

    <tr><td>Grid</td>
        <td>In connection with maps: a network of uniformly spaced parallel lines intersecting at right angles.
            When superimposed on a map, it usually carries the name of the projection used for the map that is,
            Lambert grid,
            transverse Mercator grid, universal transverse Mercator grid.
        </td></tr>

    <tr><td>Pixel coordinates</td>
        <td>In the Sentinel Toolbox, pixel values always refer to the upper
            left corner of the pixel. Pixel co-ordinates are always zero based, the pixel at <code>X=0,Y=0</code> refers
            to the upper left
            pixel of an image and the upper left corner of that pixel.
        </td></tr>

    <tr><td>Pixel value</td>
        <td>In general a composite of red, green and blue <i>sample values</i> resulting in a colour as part of an
            image.
            Within the Sentinel Toolbox, often synonymously referred to as the single, geophysical sample value of a band
            or tie-point grid.
        </td></tr>

    <tr><td>Geodetic co-ordinates</td>
        <td>Geodetic co-ordinates are given as latitude and longitude values and always refer -
            if not otherwise stated - to the WGS-84 ellipsoid.
            The geodetic co-ordinates of a pixel, always refer to the upper left corner of the pixel.
        </td></tr>


</table>

<h3>Acronyms, Abbreviations</h3>

<table>
    <tr>
        <td>AATSR</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/envisat/instruments/aatsr">
                <param name="text" value="<html><u>Advanced Along Track Scanning Radiometer</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ADS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://envisat.esa.int/handbooks/meris/CNTR2-2-2.html">
                <param name="text" value="<html><u>Annotation Data Set in an ENVISAT data product</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ASAR</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/envisat/instruments/asar">
                <param name="text" value="<html><u>Advanced Synthetic Aperture Radarr</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>BEAM</td>
        <td>Acronym for Basic ENVISAT Toolbox for (A)ATSR and MERIS</td>
    </tr>

    <tr>
        <td>COTS</td>
        <td>Commercial Off-The-Shelf Software</td>
    </tr>

    <tr>
        <td>CSV</td>
        <td>Character Separated Value</td>
    </tr>

    <tr>
        <td>ECSS</td>
        <td>European Co-operation for Space Standardisation (documents available at ESTEC at the Requirements and Standards Division)</td>
    </tr>

    <tr>
        <td>EnviView</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="http://envisat.esa.int/handbooks/gomos/CNTR3-4-2.html">
                <param name="text" value="<html><u>Software developed at ESTEC to visualise and analyse the Envisat data.</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>EO</td>
        <td>Earth Observation</td>
    </tr>

    <tr>
        <td>ESA</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.esa.int/">
                <param name="text" value="<html><u>European Space Agency</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ESRI</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.esri.com/">
                <param name="text" value="<html><u>Environmental Systems Research Institute</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ESRIN</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.esa.int/About_Us/ESRIN">
                <param name="text" value="<html><u>European Space Research Institute</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ESTEC</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.esa.int/About_Us/ESTEC">
                <param name="text" value="<html><u>European Space Research and Technology Centre</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>ENVISAT</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/envisat">
                <param name="text" value="<html><u>ESA satellite</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>GADS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://envisat.esa.int/handbooks/meris/CNTR2-2-2.html">
                <param name="text" value="<html><u>Global Annotation Data Set in an ENVISAT data product</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>HDF</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.hdfgroup.org/">
                <param name="text" value="<html><u>Hierarchical Data Format</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>HDF-EOS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://www.hdfeos.org">
                <param name="text" value="<html><u>Extended HDF format</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>MATBX</td>
        <td>BEAM's former project name</td>
    </tr>

    <tr>
        <td>MDS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://envisat.esa.int/handbooks/meris/CNTR2-2-2.html">
                <param name="text" value="<html><u>Measurement Data Set in an ENVISAT data product</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>MERIS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/envisat/instruments/meris/">
                <param name="text" value="<html><u>Medium Resolution Imaging Spectrometer Instrument</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>MERMAID</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="http://mermaid.acri.fr/home/home.php">
                <param name="text" value="<html><u>MERis MAtchup In-situ Database</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>MODIS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://modis.gsfc.nasa.gov/">
                <param name="text" value="<html><u>Moderate Resolution Imaging Spectroradiometer</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>MPH</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://envisat.esa.int/handbooks/meris/CNTR2-2-2.html">
                <param name="text" value="<html><u>Main Product Header in an ENVISAT data product</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>OSSD</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://en.wikipedia.org/wiki/Open-source_software_development">
                <param name="text" value="<html><u>Open Source Software Development</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>OBPG</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://oceancolor.gsfc.nasa.gov/">
                <param name="text" value="<html><u>Ocean Biology Processing Group (OBPG) of NASA</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>SAR</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/ers/instruments/sar">
                <param name="text" value="<html><u>Synthetic Aperture Radar</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>SeaDAS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://seadas.gsfc.nasa.gov">
                <param name="text" value="<html><u>SeaWiFS Data Analysis System</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>SeaWiFS</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://oceancolor.gsfc.nasa.gov/SeaWiFS/">
                <param name="text" value="<html><u>Sea-viewing Wide Field-of-view Sensor</u></html>">
            </object>
        </td>
    </tr>

    <tr>
        <td>SNAP</td>
        <td>
            <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
                <param name="content" value="https://step.esa.int/main/toolboxes/snap/">
                <param name="text" value="<html><u>Sentinel Application Platform</u></html>">
            </object>
        </td>
    </tr>

   <tr>
       <td>SPH</td>
       <td>
           <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
               <param name="content" value="https://envisat.esa.int/handbooks/meris/CNTR2-2-2.html">
               <param name="text" value="<html><u>Specific Product Header in an ENVISAT data product &nbsp;</u></html>">
           </object>
       </td>
   </tr>

    <tr><td>SW</td> <td>Software</td></tr>
</table>

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